Let’s venture a linear model with three predictor variables. Once again, the violent crime rate is the outcome variable, and our predictors are the percent of college grads, the percent of foreign born, and the median household income.

Table 11.9. Linear model of violent crime rate with three predictor variables (Chicago Community Data) Coefficients: Estimate Std. Error t value Pr(>|t|) (Intercept) collegegrad foreignborn 12.67536 0.55896 22.677 0.01502 0.01461 1.028